Problem
Given a positive integer N (1 ≤ N ≤ 10^9), repeatedly replace N by the sum of its digits, until N is a single digit. Print that digit.
Input format
Input
input.txt
- A single integer N
Output format
Output
output.txt
- The final single digit
Example
input
12345
output
6
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Sample cases (from the problem)
Sample Case 1
Input
12345
Expected output
6
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